<header>Prepend a Delivered-To: when...</header>

<center><tt>prepend_delivered_header</tt></center>
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This parameter controls when Postfix should prepend a <tt>Delivered-To:</tt>
message header.

<p>

By default, Postfix prepends a <tt>Delivered-To:</tt> header when forwarding
mail and when delivering to file (mailbox) and command. Turning off
the <tt>Delivered-To:</tt> header when forwarding mail is not recommended.

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